This article, has put forward the views of difference to Equivalent Expression of Negative Conditional Proposition of in the formal logic, claims when establishing Equivalent Expression of Negative Conditional Proposition, should consider difference of single incident and incident that many times occurs.

Aiming at RFID-related application characteristics,a composite subscription language was designed,the composition and use of subscription language were studied,and a matching algorithm for detecting composite events was proposed based on the time event,matching graph of composite subscription as well as con.